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ROCK CREEK, IDAHO RURAL CLEAN WATER PROGRAM TEN YEAR REPORT. 1981-1991
Description:
Prior to this program, water quality of Rock Creek, Idaho (170040212) was severely impacted by irrigated agriculture. Impairments included phosphate, organic nitrogen, suspended solids, turbidity, bacteria, and toxic chemicals. The uses of Rock Creek for recreation, drinking water supply, aesthetic enjoyment and a healthy fishery were severely impaired. Nine Best Management Practices (BMPs) were used in the project to reduce the amount of sediment, sediment related pollutants, and animal waste entering the creek. From 1987 to 1990, monitoring estimated that streambank erosion contributed 2 to more than 5 times the amount of sediment by subbasin drains during the May-August irrigation season. Results of water quality monitoring through 1990 suggested that BMPs implemented under the program have improved water quality in Rock Creek. Suspended sediment and total phosphorous loadings during the irrigation season decreased in most subbasin drains receiving treatment between 1982 and 1990. Rock Creek contributions to the Snake River showed a 75% decrease in sediment loadings and a 68% decrease in total phosphorous loading. If reductions in pollutants continue as past trends have indicated, Rock Creek could eventually fully support all designated beneficial uses. A post-project analysis was begun February 1, 1991 to analyze data and arrive at conclusions regarding quantitative relationships between land treatment and changes in water quality. 1991. In cooperation with USDA, Agricultural Stabilization and Conservation Service, Soil Conservation Service, Agricultural Research Services, ID Division of Environmental Quality, Twin Falls and Snake River Soil Conservation Districts. 328 pp.